Just to clarify - do you literally mean two bass drums or simply a double pedal? If you mean two bass drums, space limitations in a lot of churches would definitely contribute to whether or not this was feasible not. Also, "the pocket" however you define it, is not something that is achieved at the expense of variety and flavor in your playing. For example, a person can't say, "I only use one cymbal because I play "in the pocket". It wouldn't make sense. So, not playing two bass drums or a double pedal doesn't = pocket. Personally, I just invested in a double pedal about two months ago. After 25 years of playing, I never really wanted to spend the time to learn how to play the double pedal correctly. If you don't discipline yourself and your muscles, it will sound like garbage. I'm using the pedal only at home now trying to strengthen my left foot. So far, I've made a little progress. I can now do things I couldn't do before. To summarize, you shouldn't make general statements without at least defending your point of view and you shouldn't limit what elements you incorporate into your playing based on public opinion or by what everyone seems to be doing. Be your own man and do your thing. If you want to add double bass or double pedal to your playing, go ahead.
